Tutorial by Examples: i

Installation or Setup

Firebase Cloud Messaging is the Firebase service that handles push notifications. You can add this service in any client: web, Android or IOS. The specific functioning for each must be read from the documentation. For adding FCM in any type of project, is always adding a library. Considering the s...

firebase-cloud-messaging • Getting started with firebase-cloud-messaging

Dependency Injection with View Controllers

Dependenct Injection Intro An application is composed of many objects that collaborate with each other. Objects usually depend on other objects to perform some task. When an object is responsible for referencing its own dependencies it leads to a highly coupled, hard-to-test and hard-to-change code...

Swift Language • Dependency Injection

Dependency Injection Types

This example will demonstrate how to use Dependency Injection (DI) design pattern in Swift using these methods: Initializer Injection (the proper term is Constructor Injection, but since Swift has initializers it's called initializer injection) Property Injection Method Injection Example Set...

Swift Language • Dependency Injection

Sending multi-dimensional data and multiple files with CurlFile in one request

Let's say we have a form like the one below. We want to send the data to our webserver via AJAX and from there to a script running on an external server. So we have normal inputs, a multi-select field and a file dropzone where we can upload multiple files. Assuming the AJAX POST request was succ...

PHP • Using cURL in PHP

Getting started

//Create a new ExcelPackage using (ExcelPackage excelPackage = new ExcelPackage()) { //Set some properties of the Excel document excelPackage.Workbook.Properties.Author = "VDWWD"; excelPackage.Workbook.Properties.Title = "Title of Document"; excelPackage.Workboo...

epplus • Getting started with epplus

Ninja

Introduction The Ninja build system is described by its project website as "a small build system with a focus on speed." Ninja is designed to have its files generated by build system file generators, and takes a low-level approach to build systems, in contrast to higher-level build system...

C++ • Build Systems

NMAKE (Microsoft Program Maintenance Utility)

Introduction NMAKE is a command-line utility developed by Microsoft to be used primarily in conjunction with Microsoft Visual Studio and/or the Visual C++ command line tools. NMAKE is build system that falls under the Make family of build systems, but has certain distinct features that diverge fro...

C++ • Build Systems

Handling session storage through service using angularjs

Session storage service : Common factory service that will save and return the saved session data based on the key. 'use strict'; /** * @ngdoc factory * @name app.factory:storageService * @description This function will communicate with HTML5 sessionStorage via Factory Service. */ a...

AngularJS • Session storage

Create a view with schema binding

If a view is created WITH SCHEMABINDING, the underlying table(s) can't be dropped or modified in such a way that they would break the view. For example, a table column referenced in a view can't be removed. CREATE VIEW dbo.PersonsView WITH SCHEMABINDING AS SELECT name, address FROM d...

Microsoft SQL Server • Views

Common instances of Applicative

Maybe Maybe is an applicative functor containing a possibly-absent value. instance Applicative Maybe where pure = Just Just f <*> Just x = Just $ f x _ <*> _ = Nothing pure lifts the given value into Maybe by applying Just to it. The (<*>) function applies...

Haskell Language • Applicative Functor

Save to disk

//Using File.WriteAllBytes using (ExcelPackage excelPackage = new ExcelPackage()) { //create a new Worksheet ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1"); //add some text to cell A1 worksheet.Cells["A1"].Value = "My secon...

epplus • Saving the Excel document

How to setup a nested form in Ruby on Rails

The first to thing to have: a model that contains a has_many relation with another model. class Project < ApplicationRecord has_many :todos end class Todo < ApplicationRecord belongs_to :project end In ProjectsController: class ProjectsController < ApplicationController d...

Ruby on Rails • Nested form in Ruby on Rails

Blocking on async code can cause deadlocks

It is a bad practice to block on async calls as it can cause deadlocks in environments that have a synchronization context. The best practice is to use async/await "all the way down." For example, the following Windows Forms code causes a deadlock: private async Task<bool> TryThis()...

C# Language • Async-Await

Save to disk with SaveFileDialog

//Using File.WriteAllBytes using (ExcelPackage excelPackage = new ExcelPackage()) { //create a new Worksheet ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1"); //add some text to cell A1 worksheet.Cells["A1"].Value = "My fourt...

epplus • Saving the Excel document

JSP out implicit object - simply displaying date and time.

jsp • Implicit objects

Intro to Data Structures

A data structure is a way of organizing and storing information. Let a "Hello, World!" string be the information that we need to organize and store in byte-addressable memory. Each ASCII character requires 7 bits of storage. Most systems reserve 8 bits (1 byte) for each character, so eac...

data-structures • Getting started with data-structures

Interface details

Ifconfig List all the interfaces available on the machine $ ifconfig -a List the details of a specific interface Syntax: $ ifconfig <interface> Example: $ ifconfig eth0 eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx inet addr:x.x.x.x Bcast:x.x.x.x Mask:x.x.x.x ...

GNU/Linux • Network Configuration

Adding IP to an interface

An IP address to an interface could be obtained via DHCP or Static assignment DHCP If you are connected to a network with a DHCP server running, dhclient command can get an IP address for your interface $ dhclient <interface> or alternatively, you could make a change to the /etc/network/...

GNU/Linux • Network Configuration

Local DNS resolution

File: /etc/hosts contains a list of hosts that are to be resolved locally(not by DNS) Sample contents of the file: 127.0.0.1 your-node-name.your-domain.com localhost.localdomain localhost XXX.XXX.XXX.XXX node-name The file format for the hosts file is specified by RFC 952

GNU/Linux • Network Configuration

Configure DNS servers for domain name resolution

File: /etc/resolv.conf contains a list of DNS servers for domain name resolution Sample contents of the file: nameserver 8.8.8.8 # IP address of the primary name server nameserver 8.8.4.4 # IP address of the secondary name server In case internal DNS server you can validate if this server reso...

GNU/Linux • Network Configuration